With that kind of surface area to cover, and with how higher frequencies are not passing through these kinds of walls easily, you’ll have trouble finding a single router that covers it all.
You could try a router that can do a mesh network with a dedicated wireless backhaul to ensure good coverage, but if the walls are impeding the signal too much for the wireless backhaul to operate to a satisfactory speed then you may need to go with a wired backhaul, which is to run Ethernet wires from the main router to the mesh nodes.
With that kind of surface area to cover, and with how higher frequencies are not passing through these kinds of walls easily, you’ll have trouble finding a single router that covers it all.
You could try a router that can do a mesh network with a dedicated wireless backhaul to ensure good coverage, but if the walls are impeding the signal too much for the wireless backhaul to operate to a satisfactory speed then you may need to go with a wired backhaul, which is to run Ethernet wires from the main router to the mesh nodes.
OP will be “fried” before such a router AP will be able to cover such a vast area aith a usable signal.